Gas cut-off.



PATENTED SEPT. 18, 1906.

v. E. CAMPBELL.

GAS OUT-OFF.

APPLICATION FILED APE.11,1906.

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VICTOR E. CAMPBELL, OF GOLDENDALE, WASHINGTON.

GAS CUT-OFF.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application filed April 11, 1906. Serial No. 311.149.

This invention relates to cut-off attachments for burners, such as used in gas and, gasolene stoves and for illuminating purposes; and its object is to provide an attachment of this character having a spring-controlled valve of this character which is normally held closed by the spring, but which is I adapted to be locked when opened by a thermostatically-operated brake, provided the gas is ignited.

With the above and other objects in view the invention consists of a spring-controlled valve, which when opened tensions the spring. This valve is geared to a train of wheels, one of which constitutes a brakewheel, adapted to be contacted by a brakestrip. This brake-strip is operatively connected to a thermostat of peculiar construction, which when heated by the ignited gas will cause the strip to be applied to the brakewheel and hold the valve open and its spring under tension.

The invention also consists of the further novel constructions and combinations of parts hereinafter more fully described, and pointed out in the claims.

In the accompanyin drawings is shown the preferred forms of t e invention.

In said drawings, Figure 1 is a section through the casing of the device, showing one of the face-plates and the mechanism thereon in elevation. Fig. 2 is a similar view showing the opposite face-plate and the parts thereon. Fig. 3 is a section on line a: at, Fig. 1. Fig. 4 is a sectional view showing a modified form of thermostat, and Fig. 5 is a detail view showing one end of the thermostat and the brake-strip used in the modification.

Referring to the figures by numerals of reference, 1 and 2 are side plates, between which is interposed a tube 3, having an internally-threaded socket 4 at one end, adapted to be screwed upon a fixture, and a threaded teat 5 is formed at the other end of the tube to engage a burner 6. A valve 7 of the usual form extends through the tube 3 and the centers of side plates 1 and 2, and a spring 8 is coiled therearound and is fastened at one end to the valve and at the other end to a bracket 9, extending from one of the side plates.

A toothed sector 10 is secured to and rotates with valve 7, close to plate 1 and meshes with a small gear 11, secured to a shaft 12, extending through the side plates. This shaft has a ratchet-wheel 13 thereon, adapted to be engaged by a spring-pressed pawl 14, mounted on a toothed wheel 15, oosely disposed on shaft 12. A train of gears 16 is located between the plates 1 and 2 and serves to transmit motion from the wheel to a shaft 17 on which is secured a brakewheel 18. This brake-wheel is disposed adjacent the outer face of plate 2 and is normally contacted at its periphery by a spring check-strip 19, secured to and movable with the valve 7. A brake-lever 20 is pivoted upon plate 2 and consists of a pivotally mounted non-resilient body 21 and a resilient strip 21 extending therefrom, said strip normally resting close to but out of contact with the periphery of the brake-wheel.

A block 22 is secured between the plates 1 and 2 and has an opening 23 therethrough, from which extends a tube 24, of metal, which will readily expand when heated. This tube projects parallel with the tube 3 and beyond the teat thereon, so as to be heated by gas ignited at the burner. The free end of the tube 24 is closed and has a rod 25 connected to it and extendinglongitudinally through the tube and the opening 23. This rod is of material which will not readily expand when heated, and its lower end extends beyond block 22 and has a laterally-projecting finger 26, which is disposed under and supports an actuating-lever 27, pivoted at one end upon the lower portion of block 22. This lever 27 projects through a slot 28 in plate 2 and under the body 21 of lever 20, said body being held in contact with the finger by a spring 29, secured at one end to plate 2.

In using this device the gas is turned on by turning valve 7 in the usual manner. This will tension spring 8 and cause sector 10 to rotate gear 11 and shaft 12, while ratchetwheel 13 will slip under pawl 14. If the gas is not ignited, the spring 8 will return the valve to its original position as soon as released and also cause the rotation of the train of gears 16 and the brake-wheel 18. If, however, the gas is ignited, the tube 24 will expand upward and carry rod 25 therewith, causing its finger 26 to press against actuating-lever 27 and swing it and the body 21 of for driving the brake-wheel, a resilient checklever 20 upward. Strip 21 will therefore be strip movable with the valve and normally pressed and held against the brake-wheel 18, and the gearing and valve will be prevented from rotating. .Should the gas be extinguished by blowing or otherwise, the tube 24 will cool and contract, and thereby cause the brake-wheel to be released, whereupon the tensioned spring 8 of the valve will drive the gears and return the valve to closed position;

Instead of arranging the thermostat and brake-lever in the manner described the same can be constructed as shown in the modification. The rod 30 is formed of readily-expansible metal, while the tube 31 will not'so readily expand. The end of rod 30 bears directly on the brake-lever 32, and when the tube is heated the rod will expand and press the lever 32 downward against the brake-wheel.

A fan 33 or other suitable device can be used for retarding the rotation of the mech anism prior to the application of the brakelever 20.

The entire mechanism, excepting the end of the thermostat and the teat, can be inclosed by a casing '34, so as to present a neat and attractive appearance and to protect the working parts from dust, &c.

I claim- 1. The combination with a gas-tube, a valve therein and a tension device for holding the valve normally closed; of a brake-wheel, mechanism interposed between the valve and brake-wheel for actuating said wheel while the valve is being closed, a spring checkstrip rotatable with the valve and adapted to contact with the brake-wheel, a resilient brake-lever, and a thermostat for applying the lever to the wheel.

2. The combination with a gas-tube, a valve therein, and a tension device for holding the valve normally closed; of a gear movable with the valve, a train of gears, a pawl-andratchet connection between the train of gears and the gear of the valve, a brake-wheel actuated by the gears when the valve is closing, a spring chec -strip rotatable with the valve and adapted to bear upon the brake-wheel when the valve is closed, a resilient brake-lever, and a thermostat parallel with and extending above the gas-tube for applying the lever to the brake-wheel to hold the gears and the opened valve against movement.

3. The combination with a gas-tube having a burner, a casing inclosing a portion of the tube, a valve rotatably mounted within the tube and casing, and a spring withinthe casing for holding the valve normally closed of a brake-wheel within the casing, a gear rotatable with the valve, mechanism actuated by said gear only when the valve is closing bearing on the brake-wheel, said wheel constituting a stop therefor, a resilient brake'-le ver within the casing, and a thermostat extending from said casing and parallel with the tube, said thermostat adapted to apply the lever to the brakewheel to hold the gears and the opened valve against movement.

4. The combination with oppositely-disposed plates, a block interposed therebetween, and a casing inclosing said plates and block; of a gas-tube secured betweenthe plates and extending through the casing, said tube having a burner, a normally closed spring-controlled valve rotatably mounted within the tube and easing, a gear rotatable with said valve, a brake-wheel, mechanism intermediate said gear and brake-wheel for transmitting motion from the gear to the wheel only while the'valve is closing, a re silient check-strip secured to and rotatable with the valve, said strip normally contacting With and adapted to be stopped by the brake-wheel, a resilient brake-lever secured to the block, and a thermostat extending from the block and beyond the casing and close to the burner, said thermostat being adapted to apply the lever to the brake wheel tohold the brake-wheel and opened valve against movement.

5. The combination with a gas-tube, and a spring-controlled normally closed valve rotatably mounted within the tube; of a brakewheel, mechanism operated by the closing of the valve for actuating the brake-wheel, a brake-lever, an actuating-lever normally engaging the same, and a thermostat disposed adjacent to and adapted to actuate the levers to hold the brake-wheel and the valve against movement.

6. The combination with a gas-tube and a normally closed spring-controlled valve rotatably mounted within the tube; of a shaft supported adjacent the tube, a brake-wheel at one end thereof, a fan at the other end of the shaft, mechanism for transmitting rotary motion from the valve when closing, to the brakewheel, a resilient check device movable with the valve and adapted to be stopped by and to contact with the brake-wheel, a'

brake-lever, and a thermostat adjacent the tube for actuating said lever to hold the wheel and valve against movement.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

VICTOR E. CAMPBELL.

Witnesses:

M. E. GrBsoN. CHARLES EDELMAN. 

